JPH11313022A - Indoor non-volatile radio wave repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-directional indoor radio wave repeater for radio communication, which is easily prepared and low priced and further improves appearance while protecting an antenna in simple structure, for enabling radio communication without being disturbed by a radio wave obstacle even when at least one of rooms to be mutually communicated on both the sides of the radio wave obstacle is surrounded so as to disable communication by shielding radio waves for radio communication as it is. SOLUTION: In this indoor non-volatile radio wave repeater 1 composed of two antennas 2, a coaxial cable 3 and a connector 4 or the like so as to enable communication on both the sides of an indoor radio wave obstacle 5 such as a floor, wall or partition to shield radio waves, at least one of antennas 2 is provided inside an antenna box. The antenna box can be made into parallelopiped or prism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-powered radio wave repeater in a building, and more particularly to a radio wave shield for performing radio communication in a large building having floors, walls, partitions, etc. for shielding radio waves. The present invention relates to a radio repeater for wireless communication in a building for enabling wireless communication regardless of the presence of an object.

[0002]

2. Description of the Related Art In recent years, larger and larger buildings have been built, and many information processing apparatuses or OA apparatuses have been connected to each other to form a so-called system. The resulting system must be carefully maintained at all times to keep it in good working order.

[0003] In the above-mentioned maintenance work, for example, in the case of starting the site adjustment at the time of installation and taking measures against troubles, etc., it is often necessary for maintenance workers to be in each of a plurality of places and work while communicating with each other. In such a case, the telephone facilities in the existing building may be available, but there are places where telephones are not installed, and telephones installed for other work should be dedicated to maintenance work. Is often impossible, even temporarily. Therefore, the maintenance workers need to communicate with each other at an unspecified plurality of locations, and it is desirable that each of them be contacted by a dedicated wireless communication device. Usually, for this purpose, it is classified as simple wireless under the Radio Law. For example, in the 150 MHz band or 450 MHz band, the qualification of a wireless worker is limited to a small number of fixed and mobile wireless sets that are transmitted and received by each area. Instead of being approved even if it is not approved, a radio communication device of a system that is subject to various regulations in order to efficiently use radio waves jointly, such as antenna power, antenna height, and talk time, seems to be appropriate.

[0004] However, the thick floors and walls of concrete in which steel frames and reinforcing bars are embedded in today's buildings hardly transmit radio waves, and the partition walls that can be relocated are sealed from the floor to the ceiling for sound insulation and the like. In such cases, radio waves are shielded because a steel plate is usually used as a material. Since ordinary glass windows allow radio waves to pass relatively well, according to the results of experiments conducted by the present inventors, rooms facing the outside of a building, even on floors that are far away, cannot be compared with a building adjacent to the building. Wireless communication was possible between the rooms, but between rooms surrounded by walls, metal partitions, etc. inside the building,
These radio wave shields attenuate, for example, 50 dB or more, and communication with a simple wireless device was impossible. As can be understood from the application, a large and heavy wireless device with high performance is difficult to use for such a purpose, and is difficult to solve by improving the performance of the wireless communication device itself.

In order to solve these problems, in a building having a floor, a wall, a partition, and the like for shielding radio waves, each of the two rooms separated by a radio wave shield is suitable for transmitting and receiving radio waves for radio communication. An antenna is installed with the radio wave shield interposed therebetween, and a coaxial cable is passed between the antennas on both sides through a through hole having a hole diameter of at most about 2 cm formed in the radio wave shield. It has been proposed to use a radio relay for indoor wireless communication in which a connector is attached to a support portion of each of the antennas on both sides and detachably connected via these connectors.

[0006] However, in this radio wave repeater for in-building wireless communication, the antenna and the like have not been studied in detail, and the obtained characteristics have not been satisfactory. In particular, no consideration was given to the protection and appearance of the antenna.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a radio wave shield which communicates with each other as described above.
Even if at least one of the rooms is enclosed so as to block radio communication radio waves and make it impossible to communicate, it is possible to prevent the radio wave shield by installing the radio wave shield in between. The object of the present invention is to provide a radio repeater for omni-directional indoor radio communication which enables easy radio communication without any problems, and which is easy to manufacture, inexpensive, has a simple structure, protects the antenna, and improves the appearance. And

[0008]

SUMMARY OF THE INVENTION The present invention comprises two antennas, a coaxial cable, a connector, and the like, and enables communication on both sides of a building, such as a floor, a wall, a partition, etc., for shielding radio waves. In the non-powered radio wave repeater in a building, at least one of the antennas is a non-powered radio wave repeater in a building provided in an antenna box.

The present invention is also a non-powered radio wave repeater in a building, wherein the antenna box is a rectangular parallelepiped.

The present invention is a non-powered radio wave repeater in a building, wherein the antenna box is a triangular prism.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. One embodiment of a non-powered radio wave repeater in a building according to the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of an example of a radio relay system using a non-powered radio relay in a building according to an embodiment. FIG. 2 is an explanatory diagram of an antenna box used for a non-powered radio wave repeater in a building according to the embodiment.
FIG. 3 is an explanatory diagram of a modified example of the antenna box used in the non-powered electric wave repeater in the building of the embodiment.

An example of a radio wave relay system using the powerless radio wave repeater in the building of this embodiment will be described with reference to FIG.
The no-power radio wave repeater 1 in the building according to the present embodiment is provided between a radio wave transmitting side such as the base station 6 and a radio wave receiving side such as the mobile phone 7.
When the radio wave shield 5 such as a floor, a wall, or a partition is present and communication cannot be performed, the radio wave shield 5 can be attached to the radio wave shield 5 to transmit a received radio wave to the opposite side. And can communicate with each other. The coaxial cable 3 is passed through the through hole 51 provided in the radio wave shield 5, and the antenna 2 is connected to both ends of the coaxial cable 3 using the connectors 4. The antenna 2 is connected to both ends of the coaxial cable 3 via connectors 4. The connector 4 detachably connects the antenna 2 and the coaxial cable 3 to each other.

As shown in FIG. 2, the antenna 2 of the non-powered radio wave repeater 1 in the building of this embodiment includes a frequency adjusting unit 21 and
It comprises an antenna body 22, an antenna body support 23, a reflector 24, an antenna box 25 and the like. The frequency adjuster 21 adjusts the frequency of radio waves transmitted and received by the antenna 2. The antenna main body unit 22 receives radio waves from the base station 6 or the like and converts them into signal currents, or converts the signal currents into radio waves and transmits them to the mobile phone 7 or the like. The antenna main body support part 23 supports the frequency adjustment part 21 and the antenna main body part 22, and mounts the reflector 24. Reflector 24
When receiving a radio wave from the base station 6 or the like, the radio wave is reflected and collected in the antenna main body portion 22.
For example, when transmitting to the rear, a transmission radio wave to the rear is reflected to give directivity to the front. For example, an aluminum metal plate is bent twice to form a V-shape having a flat bottom portion 241, and The bottom part 241 is attached to the antenna main body support part 23. The opening angle of the V-shaped aluminum metal plate is preferably 90 degrees, and the angle with the antenna body 22 is:
Each becomes 45 degrees. The antenna box 25 accommodates and protects the frequency adjuster 21, the antenna main body 22, the antenna main body support 23, the reflector 24, and the like, and has an appearance similar to a speaker box, for example.
Even if it is installed inside the building, make sure that there is no discomfort.

The antenna 2 of the non-powered radio repeater 1 in the building according to the present embodiment includes a frequency adjuster 21, an antenna main body 22,
Since it is composed of the antenna main body support portion 23, the reflector 24, the antenna box 25, etc., it does not have a complicated structure, and is a directional antenna (for example, a Yagi antenna, a parabolic antenna) used for a conventional non-powered radio repeater in a building. Compared to
The non-powered radio wave repeater 1 can be made easily, inexpensively, and protects the antenna body 22 and the like with a simple structure, and does not cause a sense of incongruity even if it is provided inside the building. .

Although the shape of the antenna box is a rectangular parallelepiped in FIG. 2, it may be a triangular prism as shown in FIG. In this case, since the reflector 24 of the antenna 2 is V-shaped, the inner wall of the triangular prism can be used for fixing the reflector 24. In addition, it is also possible to use aluminum foil, an aluminum vapor deposition film, etc. as the reflection plate 24.

[0016]

According to the present invention, at least one of the rooms on both sides of the radio wave shield to communicate with each other,
Even if the radio wave for radio communication is shielded as it is and it is surrounded so that communication is impossible, wireless communication is possible without being blocked by the radio wave shield by installing the radio wave shield Thus, it is possible to obtain an omnidirectional indoor radio communication radio repeater which is easy to make, inexpensive, has a simple structure, protects the antenna, and has an improved appearance.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an example of a radio relay system using a powerless radio relay in a building according to an embodiment;

FIG. 2 is an explanatory diagram of an antenna box used for a non-powered radio wave repeater in a building according to an embodiment.

FIG. 3 is an explanatory view of a modification of the antenna box used in the non-powered radio wave repeater in the building of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Built-in unpowered electric wave repeater 2 Antenna 21 Frequency adjustment part 22 Antenna main part 23 Antenna support part 24 Reflection part 25 Antenna box 3 Coaxial cable 4 Connector 5 Electric wave shield 51 Through hole 6 Base station 7 Mobile phone

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mutsuji Takesada 504-2 Shinanomachi, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Electronics Service Co., Ltd.

Claims (3)

[Claims] 1. A non-powered radio repeater in a building, comprising two antennas, a coaxial cable, a connector, and the like, which shields radio waves and enables communication on both sides of a radio wave shield in a building such as a floor, a wall, or a partition. A non-powered radio repeater in a building, wherein at least one of the antennas is provided in an antenna box. 2. The non-powered radio wave repeater in a building according to claim 1, wherein the antenna box is a rectangular parallelepiped. 3. The non-powered radio wave repeater in a building according to claim 1, wherein the antenna box is a triangular prism.